Akjrigo tedescq



UNITED STATES PATENT OFFICE.

ARRIGO TEDESCO, OF TURIN', ITALY.

METHOD FOR MANUFACTURING ALUMINIUM ALLOYS.

In Drawing.

To all whom it may concern:

Be it known that l, ARRIeo Tnonsoo. a subject of the King of Italy, andresident of Turin, Italy, have invented certain new and useful Methodsfor Manufacturing Aluminium Alloys, of which the following is aspecification.

The methods usually employed in foundry Work are such that it isdifiicult to obtain aluminium alloys of high strength and desirablemechanical characteristics; and above all, it has often been found thatsuch alloys lackhomogeneity.

The present invention relates to a method by means of which theassociation of aluminium with the other metals intended to enter intothe final alloy, such as zinc, copper, titanium, and vanadium, isobtained in the best possible conditions, and particularly with a viewto obtaining a properly homogeneous alloy.

The method according to this invention consists in preparing separatelya bath of basis alloy containing a portion of from 10%. to 20% of thetotal Weight of the final alloy, said bath containing light metals to anamount of from to by Weight relatively to ethe heavy metals.

A molten mixture is thenmade of the re-- 'maining metals of the finalalloy, and a portion of from to a said mixture is added to the basisbath while it is slightly overheated and is continuously stirred with anup-and-down motion.

When the portion of from Q; to 1% of the aforesaid second mixture hasbeen added to the basis bath, the molten material thus obtained ispoured into a crucible containing a the metals of the final alloy notincluded in the basis bath or the second mixture.

By way of example, it being desired to produce an alloy having thefollowing composition:

Zinc 15.00

Titanium; -i 0.56 Aluminium 84.44;

. 10 to 20 kg. of an alloy containing alumini- Specification of LettersPatent.

.the residuum of the second mixture, this method providing a thoroughlyhomogeneous alloy having the best possible mechanical characteristics.

What I claim as my invention and desire to secure by United StatesLetters Patent is:

1. A method for manufacturing aluminium alloys consisting in preparing aseparate basis bath comprising a portion of the alloy constituents,overheating and stirring the same, making a mixture of the remainder ofsaid constituents, adding a-portion of this mixture to said basis bathWhile overheated and stirred, and pouring the material obtained into theresiduum'of said second mixture.

2. A method for manufacturing aluminium alloys consisting in preparing aseparate basis bath comprising a portion of the alloy constituents,light metals being contained in this bath to a relative amount'of towith regard to heavy metals, overheating and stirring the bath, making amixture of the remainder of said constituents, adding a portion of thismixture to said basis bath while overheated and stirred'and pouringthematerial obtained into the residuum of said second mixture.

3. A method for manufacturing aluminium alloys consisting in preparing aseparate basis bath comprising a portion of the alloy constituents,overheating and stirrin the same, making a mixture of the remain. er ofsaid constituents, adding a portion from to a of this mixture to saidbasis bath while Patented Oct. 14, 1919. Application filed July 11,1919. Serial mfaioael.

overheated and stirred, and pouring the material obtained into theresiduum of said second mixture.

4. A method for manufacturing alloys,

ents, light metals being contained in this bath to a relative amount. of1} to 5 with re-.

gard to heavy metals, overheating and stirring the bath, makin a mixtureof the re mainder of said constltuents, adding a portion from to of thismixture to said basis bath While overheated and stirred and pouring thematerial obtained into the residuum ofsaid second mixture.

Signed at Turin, Italy, June 12, 1919.

ARRIGO. TEDESCO'.

